Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Stackify Retrace - Stackify Retrace is an application performance management platform for .NET and Java developers.
BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.
King of App - King of App is an open-source mobile app builder.
MIT App Inventor - App Inventor is a cloud-based tool, which means you can create apps for phones or tablets right in your web browser.
Recast.AI - Recast.AI is the leading platform to build, connect and monitor bots.